Relating to manufacture of new secondary disazo dyes from 1:8-aminonaphthol sulphonic acid



Patented May 6, 1936 JAMES BADDILEY, 0F BLACKLEY, IVIAIGG FHCE E-IEETER, ENGLAND, ASSIGNOR TO BRITISH RELATING TO MANUFACTURE 9F IQE'W fiaECONDAEY DISAZO DYES FROM Lil-AMINO- I TAPHTHOL SR'ILIEHONIC ACID No Drawing. Application filed May 21, 1952?, Serial No. 153,387, and in Great Britain December 10, 1928. Renewed December 16, 1929.

resented by the general formula O NR N=NR -l=NR wherein R represents a divalent aryl residue containing at least one solubilizing acidic group, R represents a divalent aryl residue and R represents a coupled l :8 amino naph thol sulphonic acid and in which the nitro group is attached to E in para position to the azo group. These dyestufi's are not well suited for the commercial dyeing of cotton for while they do possess a certain aiiinity for cotton the affinity is of an inferior degree making the dyes, in view oi? the present state of the art, of little or no industrial interest as cotton dyes. On the other hand, .1 have discovered that in spite of this slight aiiinity for cotton there is inherent in these dyes a very valuable afiinity for regenerated cellulose. It is Well known that in the application of ordinary blue cotton dyes to regenerated cellulose in the form of artificial silk there is great diificulty, amounting at times to i1upossibility, in obtaining level shades. The affinity of my new dyestufis obtained according to this invention and which, as stated, yield blue shades, is of a nature diiiering from that of ordinary cotton dyes and is such that dyeings of a very superior degree of levelness and evenness may be produced. It is believed that in the present invention, an important advance in the production of dyes suitable for dyeing regenerated cellulose has been made.

Further, the nitro groups in. these colours may be reduced by means of suitable agents, such as sodium sulphide; the resulting dyestuii's may be dyed on the regenerated cellulose fibre, and if desired may be diazotized on the fibre and developed with the usual developers.

The following example illustrates our invention without limiting it, the parts being by weight:

218 parts of para nitro aniline-o-sulphonic acid are diazotized in the normal way and a solution of 137 parts of meta-amino-parzv cresol-methyl ether dissolved in an equivalent amount of hydrochloric acid is run into it. Complete combination takes place in the mineral acid medium during six hours. The monoazo colour is taken into solution in caustic soda at 35 0., 69 parts of sodium nitrite are added and the mixture is then run into hydrochloric acid. The temperature is maintained at about 35 C. for three hours, at the end of which time diazotization is complete. The mixture is then run slowly into an alkaline solution of 239 parts of 1: 8-an'1ino-naphthol-d-sulphonic acid and combination takes place rapidly, the mixture being maintained alkaline throughout. The dyestutl' is procipitatcd by addition of salt, filtered and dried. It dyes viscose silk a bright blue shade. The dyestutl' in the form of its sodlum salt has the probable formula (I/Il: fog Nil.

SOaNa N:N

0on3 11 he,

and in the dry condition is a bronze-black powder, soluble in water to a blue solution which becomes redder on addition of mineral acid and greener on addition of dilute caustic soda, dissolving in concentrated sulphuric acid to a bluish-green solution which deposits a1 violet precipitate on dilution with water.

Other examples illustrating my generic invention are quoted in the following table and R represents a coupled 1: 8 amino naphthol sulphonic' acid and in which the nitro group is attached to R in para position to the azo group, the said dyestuffs dyeing regenerated cellulose materialsin even level Secondary disazo colour from:

End component Shade pipkviscose First component Middle component para-nitroaniline-o-sulphonic acid Meta-amino-p-cresol methyl ether l-acetyl amiuo-8-naphthol-3:6-disu1- Reddis h-blue Do do lziggrgi iii o riigihthol 3:6 disulphonic Greenish-blue. Do do lzii-ainino naphthol 2:4 disulphonic Blue. para-nitroaniline-o-sulphonic acid Meta-toluidine lz -ii riiino naphtholi-sulphonic acid Blue para-nitroaniline-o-sulphonic acid Para-xylidene 1:8-amino naphthol-4-sulphouic acid Dull blue para-nitroaniline-o-sulphonic acid Cleves acid S-nitro-Z-aniino benzoic acid 2A-dinitroaniline-6-sulphonic ac1d para-nitroaniline-0-sulphonic acid do ltietg-amino-gi-cresol methyl other The nitgo group being subsequently reduced after coupling.

Tim nitro group being subsequently relduced alter coupling.

1:8amino naphthol-4-sulphonic acid Blue 1:8-atnino naphthol-a-sulphonic acid Blue do Blue 1 :8-ai(r11ino naphthol-3:6-disulphonic Blue-black 1:8-amino naphthole s'ulphonic acid Grenis'h-filue' What I claim and desire to secure by Letters Patent is p 1. The process for the manufacture of new secondary disazo dyes which comprises coupling the diazo compound of a p-nitro aryl amine-sulphonio acid with a primary aryl amine which is capable of being diazotized after being coupled, radiaz otizing and coupling with a 1: 8-amino naphthol sulphonic acid.

3. The process for the manufacture of new secondary disazo dyes which comprises coupling the diazo compound of p -nitro anilineo-sulphonic acid with a primary aryl'aniine which is capable of being diazotized after being coupled, redia'zotizing and coupling witha 1 8-aminonaphthol sulphonic acid.

4. The process for the manufacture of new secondary disazo dyes which comprises coupling the diazo compound of p-nitro aryl amine sulphonic acid with m-amino-p-cresol methyl ether, rediazotizing and coupling with a 11' 8-amino-naphthol sulphonic acid.

5. The process for the manufacture of new secondary disazo dyes which comprises coupling the diazo compound of a p-nitro anilinesulphonic acid with m-amino-p-cresolmethyl-ether, rediazotizing and combining in an alkaline medium with l-ami'no-S-naplr tholl-sulphonic acid.

6, New secondary disazo dyestuffs having the general formula containing at least one solubilizing acidic group, R represents a dlvalent aryl residue shades.

7. New secondary disazo dyestuffs having the general formula wherein R represents a divalent aryl residue containing a sulphonic acid group, R represents a divalent aryl residue and R represents a coupled 1:8 amino naphthol sulphonic acid and in which the nitro group is attached to R in para position to the 2120 group, the said dyestuffs dyeing regenerated cellulose materials in even level shades.

8. New secondary disazo dyestuffs having the general formula wherein R represents a divalent aryl residue and R represents a coupled 1': 8 amino naphthol sulphonic acid,-the said dyestuifs dyeing regenerated cellulose in even level shades.

9. New secondary disazo dyestuffs having the general formula OCHQ wherein R represents a divalentaryl residue containing a sulphonic acid group and R represents a coupled 1': 8 amino naphthol sulphonic acid and in which the nitrogroup is attached to R in para position to the 2120 group, the said dyestuffs dyeing regenerated cellulose in even level shades. V

10. New secondary disazo dyestuffs having the general formula the said dyestuffs dyeing regenerated cellulose in even level shades.

11. The new secondary disazo dyestuif having in the form of its sodium salt the probable formula NO S OsNa O CH; OH NB:

the said dyestuif being a bronze-black powder, soluble in water to a blue solution Which becomes redder on addition of mineral acid and greener on addition of dilute caustic soda, dissolving in concentrated sulphuric acid to a bluish green solution which deposits a violet precipitate on dilution with water.

In testimony whereof I have signed my name to this specification.

JAMES BADDILEY. 

